<header>
<div class="navbar navbar-inverse">
	<div class="container">
		<div class="navbar-header">
		  <button class="navbar-toggle collapsed" type="button" data-toggle="collapse" data-target=".navbar-collapse">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a class="navbar-brand hidden-sm" href="<{$base_url}>" >首页</a>
		</div>
		<div class="navbar-collapse collapse" role="navigation">
		  <ul class="nav navbar-nav">
		      <li class="active"><a target="_blank" href="<{$base_url}>/php">PHP</a></li>
		      <li><a target="_blank" href="<{$base_url}>/linux">Linux</a></li>
		      <li class="dropdown">
		          <a class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false" target="_blank" href="<{$base_url}>/web">Web开发</a>
		          <ul class="dropdown-menu">
                    <li><a href="#">Action</a></li>
                    <li><a href="#">Another action</a></li>
                    <li><a href="#">Something else here</a></li>
                    <li role="separator" class="divider"></li>
                    <li><a href="#">Separated link</a></li>
                    <li role="separator" class="divider"></li>
                    <li><a href="#">One more separated link</a></li>
                  </ul>
		      </li>
		  </ul>
		  <ul class="nav navbar-nav navbar-right hidden-sm">
		      <form class="navbar-form navbar-left" role="search">
                <div class="form-group">
                  <input type="text" class="form-control" placeholder="Search">
                </div>
                <button type="submit" class="btn btn-default">搜索</button>
              </form>
		  </ul>
		</div>
	</div>
</div>
</header>